Making Sheet Pan Meatloaf and Veggies is straightforward when you follow these steps:

1. Preheat Oven: Start by preheating your oven to 375°F (190°C).
2. Prepare Meatloaf Mixture: In a large bowl, combine the ground beef, breadcrumbs, egg, onion, garlic, Worcestershire sauce, Italian seasoning, salt, and pepper. Mix until just combined.
3. Form the Meatloaf: Transfer the mixture onto a sheet pan lined with parchment paper. Shape it into a loaf (approximately 8 inches long and 4 inches wide).
4. Prepare Vegetables: In a medium bowl, toss the mixed vegetables with olive oil, salt, and pepper until coated evenly.
5. Arrange on Sheet Pan: Place the seasoned vegetables around the meatloaf on the sheet pan, ensuring they are spread out in a single layer.
6. Bake: Place the sheet pan in the preheated oven and bake for 45 minutes, or until the meatloaf reaches an internal temperature of 160°F (70°C).
7. Rest and Garnish: Remove the pan from the oven and let the meatloaf rest for about 10 minutes. Slice the meatloaf and sprinkle fresh parsley on top for a pop of color.
8. Serve: Transfer the slices and veggies onto serving plates for a delightful presentation.

These detailed steps will help you achieve a perfectly cooked meatloaf that is flavorful and juicy, paired with deliciously roasted veggies.